METHOD AND SYSTEM FOR MEASURING INTERFACIAL TENSION BETWEEN TWO FLUIDS Russian patent published in 2024 - IPC G01N13/02 

FIELD: measurement.

SUBSTANCE: invention relates to methods and systems for measuring interfacial tension between two immiscible fluids. In compliance with proposed method for measuring interfacial tension between two fluids, X-ray transparent heat-resistant cylindrical cell is filled with first fluid to set preset pressure and temperature. Then, the X-ray transparent cell filled with the first fluid is placed in the X-ray imaging device, the cell filled with the first fluid is X-rayed, and the shooting result is stored as a background image. Second fluid is pumped into the cell filled with the first fluid, wherein the second fluid is not miscible with the first fluid and is a liquid, gas, or substance in a supercritical state, wherein the density of the second fluid is less than the density of the first fluid and which is not mixed with the first fluid; and a drop is created inside the first fluid, if the second fluid is a liquid, or a bubble, if the second fluid is a gas or a substance in a supercritical state, of second fluid. X-ray transparent cell is rotated at constant angular velocity about its axis, as a result of which the drop or bubble of the second fluid acquires a cylindrical shape inside the first fluid. X-ray imaging of a cell with a drop or a bubble of the second fluid of cylindrical shape is performed inside the first fluid and a contrast image is obtained by combined processing of the captured and background images. Radius of the cylinder formed by the drop or bubble of the second fluid inside the first fluid is determined from the contrasted image. And at the final stage, knowing density of fluids, rotation speed of the cell and radius of the cylinder formed by the drop or bubble of the second fluid inside the first fluid, interfacial tension is calculated.

EFFECT: enabling measurement of interfacial tension, including low values, between two fluids at given pressure and temperature regardless of optical transparency of the analysed fluids.

6 cl, 4 dwg